You want Photoshop to always open files with "full" (100%) zoom and not try to fit them to your screen?
Tough luck -- there is no setting for this.

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Read more Show archive.org snapshot

But, after opening the file, you can zoom to 100% by:

• pressing Ctrl-Alt-0 (on Windows; for Mac it's Meta-Alt-0)
• or double-clicking the magnifier tool icon.